I've been brewing for about 2 years now and have bottled all of my brew to share with family around holidays. Recently I saw a Party Pig at the LHBS and thought that would be the shizzle, but for $40 I should wait (I brew on a budget).
Searching for beer on craigslist netted me a pig for $5.
I bought a new gasket and replaced the screws. Bladders are $5 (each use) and a pump to activate them was $8.
This has been the best thing for sharing beer with family at holiday time! It is easy to use and tote around and I don't have to watch where the bottles go! I'd pay $40 for one of these. Very cool. And brewing a batch in the Mr. Beer keg I have from beginning brewing is a perfect match!
Makes me want to start kegging.....but I just don't have the funds for that. I'm searching CL though so you never know what I may find.